As Kris Kross fans mourn the untimely passing Wednesday of Chris Kelly, Atlanta police are investigating whether the rapper died of a possible drug overdose.

According to a spokesman for the Fulton County Medical Examiner's Office, Kelly was found unresponsive at his Atlanta home and was transported to a nearby hospital, where he was pronounced dead shortly after 5 p.m. An autopsy is set for this morning to determine how the 34-year-old "Mac Daddy" artist died.

Fulton County Police spokeswoman Cpl. Kay Lester told E! News that investigators were looking into reports that drugs were involved.

"The information we obtained at the scene leads to believe it was a possible drug overdose," she said. "We are investigating as a drug overdose unless the toxicology report from the medical examiner's office states otherwise."

According to the police report obtained exclusively by E! News, Kelly was found lying on the living room couch "unresponsive" and with "no life signs."

Chris' mother, Donna Kelly Pratt, told an investigator that the night before, Kelly was out and had taken a mixture of heroin and cocaine. Pratt (who's oddly described in the report as a "close friend" of Kelly's) stated that they had brought the MC home to recover from his drug use and had done this several times in the past. She also noted that Kelly felt nauseous all morning and passed out at approximately 3 p.m.

Kelly shot to fame as one-half of Kris Kross, best known for their 1992 hip-hop classic "Jump" as well as their signature look wearing their clothes backwards. The duo also were known for singing the "Rugrats Rap" for Nickelodeon's Rugrats and appearances on such TV shows as A Different World and In Living Color.

In the wake of Kelly's passing, Pratt and his Atlanta-based label So So Def Recordings released a statement to the Atlanta Journal-Constitution remembering the hip-hopster.

"To millions of fans worldwide, he was the trendsetting, backwards pants-wearing one-half of Kris Kross who loved making music. But to us, he was just Chris – the kind, generous and fun-loving life of the party," read the statement. "Though he was only with us a short time, we feel blessed to have been able to share some incredible moments with him. His legacy will live on through his music, and we will forever love him."